package com.itheima.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.itheima.mapper.ArticleMapper;
import com.itheima.pojo.Article;
import com.itheima.pojo.PageBean;
import com.itheima.service.ArticleService;
import com.itheima.utils.ThreadLocalUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;
import java.util.Map;

@Service
public class ArticleServiceImpl implements ArticleService {

    @Autowired
    private ArticleMapper articleMapper;



    // 新增文章
    @Override
    public void add(Article article) {

        // 补充属性值
        article.setCreateTime(LocalDateTime.now());
        article.setUpdateTime(LocalDateTime.now());

        Map<String,Object> map = ThreadLocalUtil.get();
        Integer userId = (Integer) map.get("id");
        article.setCreateUser(userId);

        articleMapper.add(article);
    }


    // 条件分页列表查询
    @Override
    public PageBean<Article> list(Integer pageNum, Integer pageSize, Integer categoryId, String state) {
        // 1.创建PageBean对象
        PageBean<Article> pb = new PageBean<>();

        // 2.开启分页查询     PageHelper
        PageHelper.startPage(pageNum,pageSize);// 返回的是Page对象

        // 3.调用mapper
        Map<String,Object> map = ThreadLocalUtil.get();
        Integer userId = (Integer) map.get("id");

        List<Article> as = articleMapper.list(userId,categoryId,state);

        // Page中提供了方法，可以获取PageHelper分页查询后 得到的总记录条数和当前页数据
        // 不强转，多肽它是不允许使用父类类型去调用子类特有的方法的，所以需要强转
        Page<Article> p =(Page<Article>) as;// Page是一个List的子类，实现类

        // 把数据填充到PageBean对象中
        pb.setTotal(p.getTotal());
        pb.setItems(p.getResult());

        return pb;

    }

    // 根据id查询文章,获取文章详情
    @Override
    public Article findById(Integer id) {
        Article a = articleMapper.findById(id);
        return a;
    }

    // 更新文章
    @Override
    public void update(Article article) {
        article.setUpdateTime(LocalDateTime.now());
        articleMapper.update(article);
    }


    // 删除文章
    @Override
    public void delete(Integer id) {
        articleMapper.delete(id);

    }
}
